It may well not be possible, as @Hyperbytes suggests, but it might be… A related request came up a while ago, about creating a Word document. An Excel file is just a collection of text files, zipped up, so in theory it might be possible.
To investigate if it’s possible/feasible, you could:
Create a sample spreadsheet in the format you want
Save the file and change the extension from xlsx to zip
Extract the contents of the file and investigate the files in a text editor
I’ve just had a quick look and it seems that sharedStrings.xml contains the data. If you put the xml code into a code beautifer, you should be able to see your data clearly and decide if the file could be created in Wappler, using one of the extensions which enables writing to a file. I don’t know if other files are changed; I expect most are not. You would need to do some research or find some information about the file format. Certainly not a trivial task.